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The linecache module allows one to get any line from any file, while
attempting to optimize internally, using a cache, the common case where many
lines are read from a single file. This is used by the traceback module
to retrieve source lines for inclusion in the formatted traceback.

Get line lineno from file named filename. This function will never raise an
exception — it will return '' on errors (the terminating newline character
will be included for lines that are found).

If a file named filename is not found, the function will look for it in the
module search path, sys.path, after first checking for a PEP 302__loader__ in module_globals, in case the module was imported from a
zipfile or other non-filesystem import source.